环境因子对4种江蓠生长的影响

Effects of Environmental Factors on the Growth of Four Species of Gracilaria

关键词:  脆江蓠  龙须菜  细江蓠  菊花江蓠  环境因子  生长

Key words:  Gracilaria bursa-pastoris  Gracilaria lemaneiformis  Gracilaria lichenoides  Gracilaria tenuistipitata  environmental factors growth

摘要:

[目的]为了更好的发展我国海南地区江蓠(Gracilaria)的人工栽培产业,考察4种不同江蓠品种在海南地区不同环境下的生长情况。[方法]比较采自广州南澳岛的脆江蓠(Gracilaria bursa-pastoris)和龙须菜(Gracilariopsis lemaneiformis)与海口当地的菊花江蓠(Gracilaria lichenoides)和细江蓠(Gracilaria tenuistipitata)在不同的盐度、温度、光照以及氮源条件下20d内的生物量变化情况。[结果]细江蓠和菊花江蓠能耐受盐度范围较宽,耐受高温能力强。脆江蓠和龙须菜对盐度的耐受范围较窄;在合适的盐度条件下,能在水温达30℃的条件下存活较长时间;添加硝酸钠能明显促进脆江蓠和龙须菜的生长。在合适的盐度条件下,脆江蓠的生长速度与当地的细江蓠相当。[结论]对脆江蓠进行良种培育与筛选,能获得适宜在海南进行推广栽培的优良江蓠藻种。

Abstract:

[Objective] We examined the growth of four species of Gracilaria in Hainan province under various conditions with the purpose of advancing the artificial cultivation of Gracilaria in this area.[Methods] Two species of Gracilaria were collected from Nan'ao isoland, Guangzhou, Guangdong Province, i.e.G.bursa-pastoris and G.lemaneiformis, and another two species were collected from Haikou, Hainan Province, i.e.G.lichenoides and G.tenuistipitata.Effects of various salinities, temperatures, light intensities, and the nitrogen supplementation on the growth of the four species of Gracilaria were investigated.[Results] G.tenuistipitata and G.lichenoides could endure wider range of salinities, higher temperature, and grow very fast.G.bursa-pastoris and G.lemaneiformis could grow under very narrow range of salinities, and could maintain biomass for about 20 days under higher temperature in their optimal salinity conditions.Supplement of nitrogen (NaNO₃) significantly stimulated the growth of these two species of Gracilaria.It was found that G.bursa-pastoris could grow as fast as G.tenuistipitata in suitable salinity condition.[Conclusion] It is proposed that G.bursa-pastoris could be a potential species used for cultivation in Hainan after further taming and selecting.